babeltrace2: upgrade 2.1.1 -> 2.1.2

babeltrace2: upgrade 2.1.1 -> 2.1.2

shortlog:
src.ctf.fs: be less strict when encountering trailing byte at the end of packetized CTF 1.8 metadata
tests: add bt_test_cli
tests: make bt_cli accept non-positional options
tests: bt_diff_cli: don't pass unexpected extra args to bt_diff
tests: remove unnecessary nonlocal keywords
Fix: Python: set local typing version to that of 3.5.2
Fix: Python: missing __contains__ method for _PluginComponentClasses
Fix: tests: Add explicit items method for Mapping compatibility
Tests: sync normand.py with upstream
Fix: tests: Add explicit __iter__ method for Iterator compatibility
Fix: Use local_typing with Python < 3.5.3

ptest results:

1..19926

DURATION: 127
END: /usr/lib/babeltrace2/ptest
2025-09-11T20:25
STOP: ptest-runner
TOTAL: 1 FAIL: 0

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>